Potassium Carbonate → 4-[4-(2,2-Difluoro-cyclopropylmethoxy)-phenyl]-piperidine hydrochloride

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Reaction Steps

4.48 g (19.2 mmol, 80%) Methanesulfonic acid 2,2-difluoro-cyclopropylmethyl ester are added to 5.93 g (19.2 mmol, 90%) 4-(4-hydroxy-phenyl)-piperidine-1-carboxylic acid tert-butyl ester and 5.36 g (38.5 mmol) K2CO3 in 60 mL DMF. Stirring is continued for 12 h at 50° C. under inert gas atmosphere. After that time, brine (50 mL) is added and the mixture is extracted with EtOAc (3×50 mL). The organic layer is separated, washed with brine, dried over sodium sulphate and the solvent is removed by evaporation. The residue is purified by column chromatography (silica gel; gradient PE:EtOAc 20:1→10:1). The residue is taken up in 20 mL DCM and 100 mL 4N HCl in EtOAc are added dropwise at 0° C. The mixture is stirred for 12 h at rt. After that time, the solvent is removed in vacuo to yield the desired product.

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